Abstract
Electroless nickel coatings on mild steel were exposed to quiescent acidic NaCl solutions. Thick coatings exhibit a frequency dispersion in the Bode phase diagram which has been attributed to a self-protective reaction of the coating involving an enriched phosphorus layer and electrolyte. The open-circuit potential (OCP) starts moving towards more negative potentials as soon as penetration of the coating has taken place, thereby triggering corrosion of the substrate . Non-uniform or porous EN coatings drift towards negative potentials with little or no frequency dispersion. The degradation of coating was monitored by electrochemical impedance spectroscopy (EIS).
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